EP0527351B1 - Device and method for picking up and for lifting and lowering of a laterally adjustable pallet as well as use of the same - Google Patents

Abstract

Stacking table picking-up device of a stack lifting device with guided carrier hooks (11) which are pivotable towards the stacking table (16), have hook openings (33) aligned with the stacking table (16), have pivot points (12) outside the stacking table (16) and have hook fingers which reach into the lifting region of the stacking table (16). <IMAGE>

Description

The invention relates to a stacking table pickup of a stacking lifting device, a stacking lifting device, a stacking feeder, a method for receiving and for lifting and lowering a stacking table that can be adjusted laterally, and the use thereof.

A stack feeder for paper sheets in sheet-fed printing machines is known from DE-OS 19 10 160, in which a stacking table is fed upwards from lifting chains to a separating device. The stacking table can be moved sideways. To take the stacking table, this document shows guided swivel levers carried by the lifting chains, which are coupled to one another via a shaft. In order to pick up the next pre-stacked system stack, the coupled swivel levers slide down after they have been decoupled from the lifting chains along guide rails. The coupled swivel levers hit the edge of the stacking table with rollers mounted on them and tilt upwards with a swivel movement. The coupled swivel levers pass the table top height and fall back into their starting position with a swivel movement. They continue to slide down to stops below the system table in order to be picked up and lifted again by the lifting chains.

The passage process at the level of the stacking table can be severely impaired in the disclosed coupled swivel lever system by the coupling and the levers which repeatedly hit the stacking table like a spring ball. At Fast-conveying machines may experience undesirable unreliability when it comes to changing stack safety and stacking safety.

In order to be able to fold back under its own weight, the levers that fold upward also require a low center of gravity of the levers below the stacking table in its carrying position. The chain guide of the pivot point must reach far down in such a system stack to accommodate stacking tables. Stacking tables of low height cannot be accommodated without additional effort. Even with the floor of the press room lowered, additional effort is necessary. The lever pivot point also requires some lateral distance from the edge of the stacking table and thus lateral loss of space for a reasonably satisfactory reliability of the pivoting back process.

US-A-3,998,448 shows a device for vertically moving a stack of sheets by means of hooks provided for receiving a pallet. Additional actuating means must be provided to operate these hooks.

The object of the invention is to provide devices and a method for the safe, reliable stacking table take-up and take-away with optimal use of space.

This object is achieved by a stacking table pickup according to the features of claim 1.

To take up the new stacking table, the downward-facing carrier hooks in the area of the stacking table are swiveled out laterally and return to their starting position below the table position in order to take the stacking table with the hook fingers as they move upwards.

The swiveling carrier hooks allow a pivot point above the support position of the stacking table in its carrier position, which means that even low stacking tables and stacking tables can be easily and securely picked up with the pressroom floor lowered.

The pivot point can be provided very close to the edge of the stacking table, making optimal use of the lateral space. The carrier hooks also allow easy lateral alignment of the stacking table.

The configuration with an energy accumulator according to claim 3 enables the stacking table to be taken along reliably even with smaller, lightweight carrying hooks. A particularly simple, inexpensive embodiment is represented by the features of claim 4.

The features of claim 5 describe a method for solving the problem.

The claimed devices and methods prove to be particularly advantageous when used with laterally adjustable paper sheet feeders in the pre-stacking mode who, on the one hand, want a reliable, quick stack change with optimal use of space even when the stacking tables are lying down, on the other hand, the carrying of the stacking tables should enable the stacking tables to be moved laterally even when used in multiple printing passes.

A preferred embodiment of the invention is shown by way of example in FIGS. 1 to 6.

Fig. 1

Seitenansicht eines erfindungsgemäßen Papierstapelanlegers einer Bogenoffsetdruckmaschine vor Einfahren des Papierstapel

Fig. 2

Ausschnittsweise Frontansicht des Papierstapelanlegers mit aufgenommenem Papierstapel und schematisch dargestellter Vorrichtung zur seitlichen Ausrichtung.

Fig. 3

Detailansicht eines erfindungsgemäßen Mitnahmehakens.

Fig. 4

Frontansicht beim Einschieben des Stapeltischs ohne Bodenberührung.

Fig. 5

Frontansicht mit Mitnahmehaken in unterster Position und mit auf abgesenktem Drucksaalboden eingefahrenen Stapeltisch.

Fig. 6 a, b, c,

Aufnahme eines bereits eingefahrenen Stapeltischs in Frontansicht.

Show

Fig. 1

Side view of a paper stack feeder according to the invention of a sheet-fed offset printing machine before the paper stack is run in

Fig. 2

Detail front view of the paper stack feeder with the paper stack picked up and a schematically illustrated device for lateral alignment.

Fig. 3

Detailed view of a driving hook according to the invention.

Fig. 4

Front view when inserting the stacking table without touching the floor.

Fig. 5

Front view with carrier hook in the lowest position and with the stacking table retracted on the lowered pressroom floor.

6 a, b, c,

Front view of an already retracted stacking table.

FIG. 1 shows a stack feeder 1, for example that of a sheet-fed offset printing press. Between two side walls 2, of which only one is shown in FIG. 1, there is the stacking area 36, into which the feed stack 13 is inserted. The paper sheets are fed, for example with the aid of a suction conveyor 4, from the stack 13 to conveyors on the feed table 3. The stack 13 is fed vertically upwards by lifting and lowering chains 5 driven by a drive unit 6 and guided around chain wheels 7 for paper sheet removal.

On the inner walls of the two side walls 2, a guide bar 8 is fastened in the stacking area 36, aligned parallel to the stacking direction. On each guide bar 8, a guide carriage 9 with rollers 10 engaging in grooves in the guide bars 8 is slidably mounted, on which there are two pivotable downward hooks 11. As can be seen from FIGS. 2 to 6, a bearing block 14, consisting of a cross member 31 and two bearing walls 30 fastened on both sides, as shown in FIG. 3, is fastened to the guide carriage 9 for the purpose of receiving the driving hooks 11. Between the two bearing walls 30, the driving hook 11 with pivot pin 12 is rotatably mounted from the cross member 31 to the part of the bearing block 14 pointing towards the stack. The curvature of the driving hook 11 is designed such that the driving finger 32 and the opening area 33 of the hook point to the center of the stack feeder 2 and thus to the stack feeder 13 when it is retracted. Between the bearing walls 30 there is sufficient space 26 below the cross member 31 for the pivoting movements of the pivot hook 11. A compression spring 27 is located below the pivot pin 12 between the cross member 31 and the pivot hook 11 provided, which is supported on the spring bearings 28, 29 on the swivel hook 11 and on the crossbar 31.

Between the side walls 2 are provided for the stack 13 in known manner contact strips 18 with contact edge 20 for the front edge of the stack 13 and side edge 18 for lateral contact parallel to the stack conveying direction. As shown in Figure 2, the lateral contact edges 19 can be adjusted laterally. For this purpose, the lateral contact edges are each provided with guide blocks 24 and 25, which are slidably mounted on an axis 23 fastened in the side walls 2 and oriented transversely to the sheet conveying direction. In threaded bores in the guide pistons 24, 25, the threaded spindles 21 and 22 engage with their threads, which are mounted so that they can rotate axially in a side wall 2. By rotating the threaded spindles 21, 22, for example with a handwheel, the side stops can be adjusted in their position.

An installation stack 13 provided for processing is inserted into the stack area 36 of the stack feeder 1, so that the front edge of the installation stack 13 lies against the front contact edges 20. With the help of the threaded spindles 21, 22, the side contact rails 19 are brought into contact with the side edges of the contact stack 13. With them, the stack 13 can also be moved into a desired lateral working position. With the aid of the lifting and lowering chain 5, to which the guide carriage 9 is fastened, the guide carriages 9 are lowered, as can be seen in FIG. 6a. When the hook fingers 32 reach the height of the feed table, they are touched in the front area thereof and, since the hook curvature at the point of contact has a favorable tangent pointing upwards towards the center of the stack, laterally in the direction of the guide bar 8 against the spring force of the spring 27 in the direction the guide bar 8 pivoted back, as shown in Figure 6b. Are the hook fingers 32 below the stacking table, they are returned to their starting position by the spring force of the spring 27. The guide carriage 9 can now, as shown in Fig. 6c, be lifted by the lifting chains 5. They engage behind the retaining bolts 15 fastened to the stacking table and thus take the stack 13 upwards in the direction of the suction cups 4. Such a stack lifting device enables simple pre-stacking. Empty stacking tables can easily be pulled out of the carrier hook 11 holding the stacking tables by hand with the guide carriage 9 still raised. The guide carriages 9 are then lowered to the new plant stack 13 which has already been inserted into the plant rails 18 which have already been set, in order to receive this directly for conveyance. The hooks 11 also allow desired lateral changes in position after receiving the contact stack 13, as can be seen in FIG. 2.

A new plant stack 13 can also be pushed in by hand, for example by hand, without contact of the stacking rollers 17 with the bottom 35, as can be seen in FIG. 4. FIG. 5 shows the stack receptacle with the floor 35 of a printing room lowered below a normal level 34 of a floor. Due to the favorable guidance and suspension of the hook 11 with its pivot point 12 in the vicinity of the stacking edge and the orientation of the pivot arm from pivot point 12 to the pick-up point on the hook finger 32, reaching relatively far downwards almost parallel to the conveying direction, almost the entire space between the pivot points can be reached 12 can be used for the permissible format width, and low-lying stacking tables can be easily accommodated.

REFERENCE SIGN LIST

1

Pile feeder

2nd

Side wall

3rd

Feed table

4th

Suction conveyor

5

Lifting and lowering chain

6

Drive unit

7

Sprocket

8th

Guide bar

9

Carriage

10th

Leadership roles

11

Carrying hook

12th

Trunnion

13

Docking pile

14

Bearing block

15

Retaining bolt

16

Stacking table

17th

Stacking rolls

18th

System bar

19th

side rail

20th

front guide rail

21

spindle

22

spindle

23

axis

24th

Guide block

25th

Guide block

26

free space

27

feather

28

Spring bearing

29

Spring bearing

30th

Storage wall

31

traverse

32

Hook finger

33

Hook opening

34

normal floor height

35

lowered pressroom height

36

Stacking area

37

Guide groove

Claims (6)

1. Stack table receiver of a stack lifting apparatus, having vertically guided, pivotably arranged receiving means for the stack table, which each exhibit a pivot point which is arranged outside the stack table, the receiving means being carrier hooks (11) which are aligned with respect to the stack table (16), the carrier hooks (11) each exhibiting a hook opening (33), provided beneath the pivot point, and a hook finger (32) reaching into the lifting range of the stack table (16), the carrier hooks (11) being hinged in a pivotable manner to carriages (9), guide strips (8) being provided for guiding the carriages (9), and each carriage (9) being arranged in driving connection with a raising and lowering chain (5).
2. Stack table receiver according to Claim 1, characterized in that each carriage (9) exhibits in each case two carrier hooks (11).
3. Stack table receiver according to one of the preceding claims 1 or 2, characterized in that the carrier hook (11) is in operating connection with an energy storage device (27).
4. Stack table receiver according to Claim 3, characterized in that the energy storage device is a compression spring (27), and in that one spring bearing (28) of the compression spring (27) is provided on the carrier hook (11) and another spring bearing (29) is provided on the carriage (9).
5. Process for receiving and for raising and lowering a stack table (16) which can be aligned laterally, in which carrier hooks (11), each exhibiting a hook opening (33) and a hook finger (32), are guided, to receive a stack, on chains (5) from the top to beneath the stack table (16), in which process they are deflected laterally from their position at the level of the stack table (16) by the latter and take up their original position again beneath the stack table, whereupon the carrier hooks are raised again by the chains (5), these automatically grasping and raising the stack table (16).
6. Use of the apparatus according to Claim 1 or of the process according to Claim 5 in a laterally adjustable paper-sheet feed in prestacking operation.

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